ELECTRIC HOUSEHOLD APPLIANCE AND FOOD PREPARATION SYSTEM WITH INTERMEDIATE TRANSFER WHEEL BETWEEN TWO TOOL COUPLERS

Description

Technical Field

[0001] The invention relates to the general technical field of household appliances for food preparation comprising a base intended to receive a working container, for example a tank, and comprising a head secured to the base comprising a planet carrier for driving a working tool, the planet carrier being driven in rotation around a central axis by a motor. Prior art

[0002] In conventional household food preparation appliances of the aforementioned type, the planet carrier generally comprises an eccentric coupler allowing the driving of a working tool above the base according to a satellite movement combining two rotations around two parallel axes. Such an appliance can be used with different working tools mounted alternately on the same coupler, adapted to different culinary tasks. These appliances are often referred to as "pastry robots", even though they can often be used for preparations other than pastry.

[0003] For example, we know of work tools of the "kneader" type, generally comprising one or more rigid arms, to allow the mixing of dough in the work container.

[0004] We also know of "whisk" type working tools, generally comprising one or more fine strands, which can be used to emulsify a preparation contained in the working container.

[0005] In stand mixers, the planet carrier is usually rotated at a relatively low speed, for example between 40 and 250 revolutions per minute. The lower speeds are well suited to certain culinary tasks, and therefore to certain work tools intended for these tasks, for example for work tools of the "kneading" type. However, some works culinary, and the work tools dedicated to them, require or even benefit from higher rotation speeds of the work tool. This is the case, for example, of "whisk" type work tools.

[0006] We also know, for example from document GB2453546, a household appliance for food preparation which is designed to be able to drive two different types of work tools. This appliance comprises: a base having a base having a reception area configured to receive a working container; a head linked to the base, the head having a planet carrier which is driven in rotation around a central axis by a motor, and which carries: ▪ a first drive satellite, mounted to rotate freely on the planet carrier around a first working axis, parallel to the central axis and eccentric with respect to the central axis, the first drive satellite comprising: ◊ a first coupler configured to allow coupling and uncoupling of a first working tool and to ensure the driving of the first working tool in rotation around the first working axis with respect to the planet carrier, the first coupler being arranged opposite the reception area;◊ a first drive toothed wheel which has as its axis the first working axis, which is integral in rotation with the first drive satellite, and which cooperates with an internal toothing of a peripheral crown having the central axis as axis of symmetry to, during a differential rotation of the planet carrier relative to the peripheral crown, cause a rotation of the first drive satellite on itself around the first working axis;▪ a second drive satellite, distinct from the first drive satellite and mounted to rotate freely on the planet carrier around a second working axis, parallel to the central axis and eccentric with respect to the central axis while being distinct from the first working axis, the second drive satellite comprising: ◊ a second coupler configured to allow coupling and uncoupling of a second working tool and to ensure the driving of the second working tool in rotation around the second working axis with respect to the planet carrier, the second coupler being arranged opposite the receiving zone; ◊ a second drive toothed wheel which has the second working axis as its axis and which is integral in rotation with the second drive satellite. ;

[0007] In this example, the second drive gear meshes with a second peripheral ring gear having the central axis as the axis of symmetry to drive the second drive satellite in rotation on itself around the second working axis.

[0008] The two crowns are superimposed in the direction of the central axis, and one of them has a conical toothing, which is complex to produce and which results in significant bulk in the direction of the central axis.

[0009] A household appliance for food preparation according to the characteristics of the preamble of claim 1 is known from document CN103720387. Statement of the invention

[0010] The aim of the invention is to propose a household appliance for food preparation offering a first working tool coupler and a second working tool coupler which rotate, while maintaining a simple, economical construction, and not requiring major modification of the architecture of existing appliances.

[0011] For this purpose, the invention proposes a household appliance for food preparation comprising: a base having a base having a reception area configured to receive a working container; a head linked to the base, the head having a planet carrier which is driven in rotation around a central axis by a motor, and which carries: ◊ a first drive satellite, mounted to rotate freely on the planet carrier around a first working axis, parallel to the central axis and eccentric with respect to the central axis, the first drive satellite comprising: ∘ a first coupler configured to allow coupling and uncoupling of a first working tool and to ensure the rotational driving of the first working tool around the first working axis with respect to the planet carrier, the first coupler being arranged opposite the reception area;∘a first drive toothed wheel which has as its axis the first working axis, which is integral in rotation with the first drive satellite, and which cooperates with an internal toothing of a peripheral crown having the central axis as axis of symmetry to, during a differential rotation of the planet carrier relative to the peripheral crown, cause a rotation of the first drive satellite on itself around the first working axis;◊ a second drive satellite, distinct from the first drive satellite and mounted to rotate freely on the planet carrier around a second working axis, parallel to the central axis and eccentric relative to the central axis while being distinct from the first working axis, the second drive satellite comprising: ∘ a second coupler configured to allow coupling and uncoupling of a second working tool and to ensure the rotational drive of the second working tool around the second working axis relative to the planet carrier, the second coupler being arranged opposite the reception zone;∘ a second drive gear wheel which has as its axis the second working axis, which is integral in rotation with the second drive satellite, the second drive gear wheel cooperates with the first drive gear wheel indirectly, by means of at least one intermediate transmission wheel, mounted freely in rotation on the planet carrier, so that the first drive gear wheel drives in rotation the second drive gear wheel and the second drive satellite in rotation on themselves around the second working axis, by means of the at least one intermediate transmission wheel, characterized in that the second drive satellite rotates, around the second working axis, in the same direction of rotation as the direction of rotation of the first drive satellite around the first working axis. ;

[0012] The household food preparation appliance may also have one or other of the following characteristics, taken alone or in combination.

[0013] In some embodiments, the first drive gear meshes directly with the peripheral ring gear, without an intermediate mechanical element.

[0014] In some embodiments, the second drive gear cooperates with the first drive gear indirectly, via a single intermediate transmission wheel, mounted freely rotatable on the planet carrier, the single intermediate transmission wheel meshing directly with the first drive gear and, simultaneously, meshing directly with the second drive gear.

[0015] In some embodiments, the food preparation appliance comprises several intermediate transmission wheels arranged in cascade between the first drive toothed wheel and the second drive toothed wheel, the intermediate transmission wheels being externally toothed toothed wheels mounted freely to rotate on the planet carrier.

[0016] The first drive gear and the second drive gear may each have a different number of teeth.

[0017] The second drive gear wheel may have a smaller number of teeth than the first drive gear wheel such that, for a given speed of the planet carrier, the second drive planetary gear rotates, around the second working axis, at a rotational speed whose absolute value is greater than the absolute value of the rotational speed of the first drive planetary gear around the first working axis.

[0018] In some embodiments, the second drive planetary gear rotates, about the second working axis, at a rotational speed of between 1.1 and 2.0 times the rotational speed of the first drive planetary gear about the first working axis.

[0019] In some embodiments, the peripheral ring gear, the first drive gear, the second drive gear, and the intermediate transmission gear are coplanar.

[0020] The food preparation appliance can be designed so that: the peripheral crown wheel has a single internal toothing, the first drive gear wheel is a gear wheel having a single external toothing which meshes directly with the internal toothing of the peripheral crown wheel, the intermediate transmission wheel is a gear wheel having a single external toothing which meshes directly with the external toothing of the first drive gear wheel, and the second drive gear wheel has an external toothing which meshes directly with the external toothing of the intermediate transmission wheel.

[0021] In some embodiments, the first working axis and the second working axis have the same eccentricity relative to the central axis.

[0022] In some embodiments, the first coupler and the second coupler may have first and second work tool coupling geometries, respectively, that are different from each other.

[0023] The invention also relates to an electrical household food preparation system comprising: ▪ a household food preparation appliance having any of the preceding characteristics; ▪ a first working tool configured to allow its coupling to the first coupler of the household food preparation appliance, ▪ a second working tool configured to allow its coupling to the second coupler of the household food preparation appliance.

[0024] In such an electrical food preparation system, the first work tool may be configured to prohibit its coupling to the second coupler and / or the second work tool may be configured to prohibit its coupling to the first coupler.

[0025] In such an electrical food preparation system, the first coupler may be configured to prohibit coupling of the second work tool and / or the second coupler may be configured to prohibit coupling of the first work tool.

[0026] Such an electrical food preparation system may be configured to prevent the simultaneous mounting of one work tool on the first coupler and another work tool on the second coupler. Brief description of the drawings

[0027] [ Fig. 1 ] There figure 1is a general schematic perspective view of a household appliance for food preparation in which the invention can be implemented. [ Fig. 2 ] There figure 2 is a partial schematic side view of a part of a household food preparation appliance in which the invention can be implemented. [ Fig. 3 ] There figure 3 is a partial schematic perspective view of part of a household food preparation appliance comprising two couplers for two work tools. [ Fig. 4 ] There figure 4 is a schematic perspective view illustrating a peripheral crown and a planet carrier with two drive satellites, according to one embodiment of the invention. [ Fig. 5 ] There Figure 5is a schematic exploded perspective view illustrating a planet carrier with two drive satellites, similar to that of the Fig. 4 . [ Fig. 6 ]. There figure 6 is a schematic top view of the elements of the Fig. 4 . Description of the embodiments

[0028] THE Figs. 1 to 3 represent an electrical household food preparation system 10 comprising on the one hand a household appliance for food preparation 12, of the pastry robot type, and on the other hand a first work tool 14.1 and a second work tool 14.2 intended to be mounted on the household food preparation appliance 12 to act on food as part of culinary preparation. In the examples that follow, the first working tool 14.1 is for example a kneading tool, while the second working tool 14.2is for example a whip. In the general case, the first work tool 14.1 and the second working tool 14.2 are two work tools of different types, with different geometry, particularly at the level of the active surfaces of the work tool which are those intended to act on food in the context of the culinary preparation for which they are intended. The first work tool 14.1 and the second working tool 14.2 can be designed to be optimally implemented at different rotation speeds around their working axis.

[0029] The household appliance for food preparation 12 includes a base 15, here in the shape of a foot, comprising a base 16 substantially horizontal and a jamb 18 which extends vertically upwards from the base 16. The base 15is intended to rest on a horizontal work surface. The base 16 includes a reception area 17 configured to receive a work container 20, here in the form of a tank, generally removable. The working container 20 is for example removably mounted on the reception area 17 of the base 16 by a bayonet connection. The household appliance for food preparation 12 also includes a head 22 which, in this example, is articulated on the base 15 around a horizontal axis A0 , here at the jamb level 18. In cases where the head 22 is articulated around the horizontal axis A0 , it can be movable between a raised position, not shown, in which the working container 20 can be easily removed from the base 16, and a working position, illustrated in particular on the Fig. 1. The concepts of "horizontal", "vertical", "top" and "bottom", and the concepts of orientations which result from them, refer to normal orientations of the household appliance for food preparation 12 in operating condition when the base 15 is placed on a horizontal work surface, and correspond to the representation of the figures.

[0030] The head 22 of the household appliance for food preparation 12 has a shape that extends in a longitudinal direction, horizontal in the working position, with a rear longitudinal portion by which it is linked to the jamb 18 from the base 15, and a front longitudinal part which extends overhanging above the base 16 and the working container 20. The head 22 may contain an engine 30, preferably an electric motor, shown in the Fig. 2 ,whose start and speed can be controlled, for example, by a control button 24 arranged for example on a side face of the jamb 18. The engine 30 arranged inside the head 22 has a motor shaft oriented along a motor axis which, depending on the design, can be horizontal or vertical. Alternatively, the motor 30 can be arranged in the base 15.

[0031] In a manner known per se, the front longitudinal portion of the head 22 includes a satellite carrier 26 comprising means for driving a first work tool 14.1, and even a second work tool 14.2, according to a planetary motion. For this purpose, the planet carrier 26 is mobile in rotation around a central axis AC. In the illustrated example, the central axis AC is fixed relative to the head 22.The satellite carrier 26 is driven by the engine 30 via a kinematic chain 25 according to a design widely known to those skilled in the art. Each of the first work tools 14.1 and second work tool 14.2 is intended to be mounted on the planet carrier 26 to be driven into a working movement by the planet carrier 26. In working position, the first working tool 14.1 or the second work tool 14.2 mounted on the planet carrier 26 is engaged inside the working container 20 to act on food contained in the working container 20.

[0032] In the example shown, the planet carrier 26 is made in the form of a disc-shaped turntable. The planet carrier 26 is mounted securely at the lower end of a drive shaft 27whose axis is the central axis AC. The drive shaft 27 is received in the head 22 and is guided, inside the head 22, rotating around the central axis AC. The drive shaft 27 wears a training wheel 29 which is part of the kinematic chain 25 by which the satellite carrier 26 is driven by the engine 30. Here, the training wheel 29 is arranged on an upper portion of the drive shaft 27 which extends for example above an internal horizontal wall (not shown) through which the drive shaft 27 of the planet carrier can be guided in rotation.

[0033] The satellite carrier 26 carries a first training satellite 28.1 which is mounted freely rotating on the planet carrier 26 around a first axis of work A1,parallel to the central axis AC and eccentric with respect to the central axis AC.

[0034] In the illustrated example, as seen in particular on the Fig. 5 , the first training satellite 28.1 has a stem 31.1 which extends along the first axis of work A1 and which is rotatably mounted through the disc-shaped plate which forms the planet carrier 26. The first training satellite 28.1 thus has a lower portion which protrudes below the lower face of the planet carrier 26, therefore facing the reception area 17, and an upper portion which projects above an upper face of the planet carrier 26. In the example shown, the upper portion of the first drive satellite 28.1 therefore extends into a protected volume, above the satellite carrier 26,which can be considered as being included in the head 22.

[0035] The first training satellite 28.1 includes a first coupler 30.1 configured to allow coupling and uncoupling of the first work tool 14.1 on the first training satellite 28.1, in a working configuration, and to ensure the rotational drive of the first working tool 14.1 around the first axis of work A1 compared to the satellite carrier 26. The first coupler 30.1 is arranged opposite the reception area 17. In the example shown, the first coupler 30.1 is arranged at the lower end of the rod 31.1 of the first training satellite 28.1, so below the satellite carrier 26.

[0036] The first training satellite 28.1also includes a first drive gear wheel 32.1 which has as its axis the first axis of work A1, and which is integral in rotation with the first drive satellite 28.1. In the example, this results from the fact that it is mounted integral with its rod 31.1. As known, the first drive gear wheel 32.1 cooperates with an internal toothing of a peripheral crown 34 having the central axis AC as the axis of symmetry for, during a differential rotation of the planet carrier 26 relative to the peripheral crown 34, cause rotation of the first drive satellite 28.1 on itself around the first axis of work A1.

[0037] In the example shown, the first drive gear 32.1 meshes directly with the internal teeth of the peripheral crown 34.However, one might predict that the first drive gear 32.1 cooperates indirectly with the internal teeth of the peripheral crown 34, for example via an intermediate gear wheel.

[0038] In the example shown, the peripheral crown 34 is fixed relative to the head 22, but one could predict that the peripheral crown 34 is rotated around the central axis AC relative to the head 22, in particular in a direction opposite to the direction of rotation of the planet carrier 26 around the central axis AC.

[0039] In the example shown, the first drive gear 32.1 is carried by the upper portion of the first drive satellite 28.1. It is therefore arranged above the satellite carrier 26,in this case above the disc-shaped turntable. The first drive gear 32.1 is therefore received in a protected volume, above the satellite carrier 26, and is not visible from the outside of the food preparation appliance 12.

[0040] In the illustrated example, the peripheral crown 34 is carried by the head 22 and it is fixed relative to the head 22. It is arranged just above the satellite carrier 26, in this case in the protected volume above the satellite carrier 26. In the example shown, the peripheral crown 34 has roughly the same dimensions as the planet carrier 26 in a diametrical direction relative to the central axis AC.

[0041] The satellite carrier 26 carries a second training satellite 28.2,separate from the first drive satellite 28.1. This second training satellite 28.2 is also mounted freely rotating on the planet carrier 26 around a second axis of work A2, also parallel to the central axis AC and eccentric with respect to the central axis AC. The second axis of work A2 is distinct from the first line of work A1.

[0042] In the example shown, the second drive satellite 28.2 has a stem 31.2 which extends along the second axis of work A2 and which is rotatably mounted through the disc-shaped plate which forms the planet carrier 26. The second training satellite 28.2 thus has a lower portion which protrudes below the lower face of the planet carrier 26, therefore facing the reception area 17,and an upper portion which projects above an upper face of the planet carrier 26. In the example shown, the upper portion of the second drive satellite 28.2 therefore extends into the same protected volume as the upper portion of the first drive satellite 28.1, above the satellite carrier 26.

[0043] Analogously to the first training satellite 28.1, the second training satellite 28.2 includes a coupler, here called second coupler 30.2, which is configured to allow coupling and uncoupling of a second work tool 14.2 on the second drive satellite 28.2, in a working configuration, and to ensure the rotational drive of the second working tool 14.2 around the second axis of work A2 compared to the satellite carrier 26. The second coupler 30.2is arranged opposite the reception area 17. In the example shown, the second coupler 30.2 is also arranged at the lower end of the stem 31.2 of the second training satellite 28.2, so below the satellite carrier 26.

[0044] Likewise, the second training satellite 28.2 has a second drive gear 32.2 which has as its axis the second axis of work A2 and which is integral in rotation with the second drive satellite 28.2. In the example, this results from the fact that it is mounted integral with its rod 31.2.

[0045] According to the invention, the second drive gear wheel 32.2 cooperates with the first drive gear 32.1 indirectly, via an intermediate transmission wheel 40. The intermediate transmission wheel 40is mounted freely in rotation on the planet carrier 26, around an intermediate axis Have which is parallel to the working axes A1 And A2 respectively of the first drive gear 32.1 and the second drive gear 32.2. In this way, the first drive gear 32.1 drives the second drive gear 32.2 and the second training satellite 28.2 rotating on themselves around the second working axis A2, via the intermediate transmission wheel 40. Preferably, as in the version illustrated in the figures, the second drive gear 32.2 cooperates with the first drive gear 32.1 indirectly, through a single intermediate transmission wheel 40, the single intermediate transmission wheel 40being an externally toothed gear wheel which, simultaneously, meshes directly with the first drive gear wheel 32.1 and with the second drive gear 32.2. However, it could be expected that the household appliance for food preparation 12 has several intermediate transmission wheels 40, arranged for example in cascade between the first drive gear wheel 32.1 and the second drive gear 32.2, the intermediate transmission wheels 40 being externally toothed gears mounted freely in rotation on the planet carrier 26. The number of intermediate transmission wheels 40 in cascade is an odd number, with the consequence that the first drive gear 32.1 and the second drive gear 32.2 revolve around their respective work axis A1, A2in the same direction of rotation.

[0046] For embodiments comprising a single intermediate transmission wheel 40, and for those with several intermediate transmission wheels 40, the intermediate transmission wheel(s) 40 can be coplanar with each other and coplanar with the peripheral crown 34, with the first drive gear 32.1 and with the second drive gear 32.2. This condition is met if there exists a plane perpendicular to the central axis AC which cuts the teeth of each of the peripheral crowns 34, of the first drive gear 32.1, the second drive gear 32.2, and the intermediate transmission wheel(s) 40. This allows you to obtain a household appliance for food preparation 12particularly compact, especially along the direction of the central axis AC. For the purposes of this application, this condition is met if there is a plane perpendicular to the central axis AC which cuts the teeth of each of the peripheral crowns 34, of the first drive gear 32.1 and the second drive gear 32.2, and the intermediate transmission wheel(s) 40.

[0047] In the embodiment illustrated in the figures, the intermediate transmission wheel 40 has a single toothing cooperating with both the first drive gear wheel 32.1 and with the second drive gear 32.2. It is however possible to consider that the intermediate transmission wheel(s) 40have a double toothing, that is to say a first toothing and a second toothing coaxial but offset on the axis of rotation, so that one of the teeth is driven and the other tooth is driving. For example, in the case of a single intermediate transmission wheel 40, the first tooth would be driven by the first drive gear 32.1 and the second tooth would drive the second drive gear 32.2. As an alternative or in addition, it is also possible to consider that the first drive gear wheel 32.1 has double teeth, that is to say that the first tooth would be driven by the peripheral crown 34 and that the second toothing would drive the intermediate transmission wheel 40.

[0048] We therefore note that the second drive gear wheel 32.2 does not cooperate directly with the peripheral crown34, in the sense that it is not directly meshed with the teeth of the peripheral crown 34. This cascade drive simplifies construction and, in particular, simplifies geometric tolerances for parts and assemblies. In fact, the first drive gear wheel 32.1, the intermediate transmission wheel 40, and the second drive gear 32.2 are carried by the same part, namely the planet carrier 26, while each being mounted to rotate independently of each other on this planet carrier 26.The dimension chains to be respected to obtain a cooperation ensuring the driving of one by the other are relatively short, and can therefore be respected quite easily during manufacturing and assembly, without having to take design and production precautions that are costly to implement. On the other hand, the direct meshing between the peripheral crown 34 and the first drive gear 32.1 is more complex to achieve because it involves the satellite carrier 26 which is a moving (rotating) part both in relation to the peripheral crown 34 and relative to the first drive gear 32.1. The The chain of dimensions to be respected is therefore longer, involving more manufacturing and assembly constraints, and therefore inevitably a higher production cost. This longer chain of dimensions is therefore not found at the level of the second drive gear wheel32.2.

[0049] It is noted that the peripheral crown 34, the first drive gear 32.1, the intermediate transmission wheel 40, and the second drive gear 32.2 are all arranged above the satellite carrier 26.

[0050] In the example, the first drive gear 32.1 and the second drive gear 32.2 are wheels of cylindrical geometry around their respective axes A1, A2. In this way, they each have a toothing of cylindrical overall geometry around their respective axes. A1, A2. Consequently, the geometry of the peripheral crown teeth 34 is also a surface of cylindrical global geometry, this time around the central axis AC.

[0051] However, other complementary geometries could be provided. Thus, it could be provided that the first drive gear wheel 32.1 and the second drive gear 32.2 are wheels of conical geometry around their respective axes A1, A2, each having a conical toothing around their respective axes A1, A2. In addition, the toothing of the peripheral crown 34 and that(s) of the intermediate transmission wheel(s) 40 would also be in this case a bevel tooth.

[0052] In the example shown, the peripheral crown 34 is an annular toothed crown which has a single internal toothing. Thus, the first drive toothed wheel 32.1 is a toothed wheel comprising a single external toothing which cooperates by direct meshing with the single internal toothing of the peripheral crown 34.Finally, the second drive gear wheel also has a single external toothing which meshes directly with the single external toothing of the first drive gear wheel. The toothing of the crown wheel or a wheel is unique insofar as it is defined by a number of teeth having a unique tooth profile. A single toothing of the crown wheel or a wheel may have, for example, an annular groove around the axis of said crown wheel or said wheel, the groove separating each tooth of the single toothing into two parts successively according to the direction of extension of the generating curve of the tooth.

[0053] However, it could be expected that there would be an axial offset, for example between the first drive gear 32.1 and the second drive gear 32.2. For example, the first drive gear 32.1 and the second drive gear 32.2could be axially offset such that there is no plane perpendicular to the central axis AC cutting both the teeth of the first drive gear 32.1 and the second drive gear 32.2. In such a case, one could have an intermediate transmission wheel 40 which has an axial extension sufficient to mesh directly with both the first drive gear wheel 32.1 and with the second drive gear 32.2. It can then be an intermediate transmission wheel 40 having a single toothing. We can also have a double intermediate transmission wheel, in the form of two coaxial intermediate transmission wheels superimposed and linked in rotation around their common axis Have, with one of them meshing directly with the first drive gear 32.1and the other which meshes directly with the second drive gear wheel 32.2.

[0054] In the example shown, the teeth of the peripheral crown 34, of the first drive gear 32.1, of the intermediate transmission wheel 40, and the second drive gear 32.2 are straight teeth, with teeth whose generators are rectilinear and parallel to the respective axes of the three components, which are themselves parallel to each other. However, one could provide for the teeth to be helical teeth, or herringbone teeth, etc., and this whether the tooth is cylindrical or conical.

[0055] In the example, the second drive gear 32.2 is carried by the upper portion of the second drive satellite 28.2. It is therefore arranged above the satellite carrier 26,in this case above the disc-shaped turntable. The second drive gear 32.2 is therefore received in the same protected volume as the first drive gear wheel 32.1 and that the peripheral crown 34, above the satellite carrier 26, and is therefore not visible from the outside of the food preparation appliance 12. The same therefore applies to the intermediate transmission wheel(s). 40.

[0056] The household appliance for food preparation 12 may be of the type in which, for a given speed of the planet carrier 26, the first training satellite 28.1 and the second training satellite 28.2 rotate around their respective working axis A1, A2,respectively at rotational speeds different from each other in absolute value. Preferably for a given speed of the planet carrier, the second drive satellite 28.2 revolves around the second axis of work A2, at a rotational speed greater in absolute value than the absolute value of the rotational speed of the first drive satellite 28.1 around the first axis of work A1. For example the second drive gear 32.2, and therefore the second training satellite 28.2 rotate, around the second axis of work A2, at a rotational speed whose absolute value is between 1.1 and 2.0 times the absolute value of the rotational speed of the first drive satellite around the first working axis A1.This is particularly advantageous because it is then possible to drive the first working tool at a first working speed, or the second working tool at a second working speed, which is different, in particular higher and for example between 1.1 and 2.0 times the first working speed, with the same motor speed. 30,and with the same speed of the kinematic chain between the motor and the tool holder. Even more advantageous, knowing that the motor speed is generally limited on the one hand with a minimum value and on the other hand with a maximum value, the two different speeds of the two couplers make it possible to broaden, in absolute value, the ratio of value ranges for the working tools. Thus, the first coupler will be used for working tools that require a low speed, and possibly a high torque, and the second coupler will be used for working tools that require a high speed, possibly under a lower torque.

[0057] In total, the household appliance for food preparation 12, the first work tool 14.1 and the second working tool 14.2 belong to the household electrical system for food preparation 10which includes the household appliance for food preparation 12, at least one first work tool configured to allow its coupling to the first coupler of the household food preparation appliance 12, and at least one second working tool configured to allow its coupling to the second coupler of the food preparation appliance 12.

[0058] As shown in the illustrated embodiment, which has a single intermediate drive wheel 40, the second drive gear 32.2 has a number of teeth, and therefore a diameter, different from that of the first drive gear 32.1, in this case a lower number of teeth. In embodiments in which the second drive gear 32.2 cooperates with the first drive gear 32.1via a single intermediate transmission wheel 40, the ratio of the absolute values ​​of the rotational speeds between the second drive gear wheel 32.2 and the first drive gear 32.1 is inversely proportional to the ratio of the number of teeth of the second drive gear 32.2 relative to the first drive gear 32.1.

[0059] In the illustrated example, the first axis of work A1 and the second axis of work A2 have the same eccentricity relative to the central axis AC. We can say that they are arranged on the same diameter, or that they are arranged at the same distance from the central axis AC.This allows for comparable working tool geometries for the first working tool and for the second working tool, in relation to the geometry of the container. For this, it is important that the second drive gear 32.2 has a number of teeth, and therefore a diameter, different from that of the first drive gear 32.1, because, even with working axes arranged with the same eccentricity relative to the central axis AC, any interference between the second drive gear is avoided 32.2 and the teeth of the peripheral crown 34.

[0060] However, it could be expected that the first line of work A1 and the second axis of work A2 have a different eccentricity, compared to the central axis AC, with for example a second axis of work A2 having an eccentricity less than that of the first working axisA1 relative to the axis AC. With such an arrangement, we obtain the possibility, for the same work container, of having a second work tool 14.2 having a larger diameter, for the benefit of a greater tangential speed of the working tool for the same rotation speed around the second working axis A2.

[0061] In some embodiments, the first coupler 30.1 and the second coupler 30.2 may have the same working tool coupling geometry. In this case, it is possible that the same working tool can be mounted indifferently on the first coupler 30.1, so on the first training satellite 28.1 or on the second coupler 30.2, so on the second training satellite 28.2.

[0062] However, it can be advantageously provided that the first coupler 30.1 and the second coupler30.2 respectively have a first and a second working tool coupling geometry which are different from each other.

[0063] In fact, different coupling geometries are known between a work tool and the household appliance for food preparation. 12.A coupling geometry determines a coupling mechanism whose role is to ensure the attachment of the working tool to the drive satellite in conditions suitable for enabling the working tool to perform the culinary preparation work for which it is designed. Typically, the coupling geometry allows the working tool to be locked relative to the coupler in all directions. For example, coupling geometries are known that define a bayonet-type coupling mechanism. Coupling geometries are also known that define a coupling mechanism comprising a rod with a flat, or a notched rod, or a rod with one or more radial protrusions, forming part of either the working tool or the coupler, and a complementary shaped bore on the other of the working tool and the coupler.Typically, the coupling geometry defines a coupling mechanism that allows manual coupling and uncoupling of the work tool to the coupler, thus without requiring the use of tools to perform the coupling.

[0064] By having different coupling geometries on the one hand for the first coupler 30.1 and the first work tool 14.1 and on the other hand for the second coupler 30.2 and the second working tool 14.2, the coupling geometry can be adapted to the respective work planned for these two working tools, and in particular to the torque of the forces which are applied to the working tool, therefore to the coupler, during work.

[0065] In particular, it can be advantageously provided that the first coupler 30.1 be configured to prohibit the coupling of the second work tool 14.2 and / or in that the second coupler 30.2be configured to prohibit the coupling of the first work tool 14.1. Note that it is possible to prohibit the assembly of the first work tool 14.1 on the second coupler 30.2 without necessarily prohibiting the assembly of the second work tool 14.2 on the first coupler 30.1, or vice versa.

[0066] Advantageously, the household appliance food preparation system 10 can be configured to prevent simultaneous mounting of the first working tool 14.1 on the first coupler 30.1 and the second work tool 14.2 on the second coupler 30.2. For example, such an electrical food preparation system 10may include a cover which would be mounted movably on the planet carrier between two positions, one in which it would give access to the first coupler and prevent access to the second coupler and the other in which it would give access to the second coupler and prevent access to the first coupler. In addition or as an alternative, such an electrical household food preparation system 10 could include a cover that would be linked to a work tool and which, when this work tool is coupled to the corresponding coupler, would prevent access to the other coupler.

[0067] Preferably, the first line of work A1 and the second axis of work A2 are spaced apart from each other around the central axis ACof an angle less than or equal to 180 degrees of angle, more preferably less than or equal to 120 degrees of angle, more preferably less than or equal to 90 degrees of angle. In the illustrated example, in which the second drive gear 32.2 cooperates indirectly with the first drive gear 32.1 via an intermediate transmission wheel 40, the first line of work A1 and the second axis of work A2 are spaced apart from each other around the central axis AC of an angle within the range of 45 degrees angle to 90 degrees angle.

[0068] In the example shown, the intermediate transmission wheel 40 is arranged so that its axis of rotation Have also has the same eccentricity with respect to the central axis AC that the first line of work A1 and that the second axis of work A2.However, it could have an eccentricity different from that of one or the other of these axes, or even different from that of both of these axes. For example, it could be provided that the intermediate transmission wheel 40 is arranged so that its axis of rotation Have present, relative to the central axis AC, an eccentricity less than that of the first working axis A1, and possibly also lower than the second axis of work A2. With an intermediate transmission wheel arrangement 40 radially inward relative to the first drive gear 32.1 and relative to the second drive gear 32.2, for identical wheel diameters, the first drive gear wheel can be brought angularly closer together 32.1 and the second drive gear 32.2,with a reduced angular spacing between the first working axis A1 and the second axis of work A2 around the central axis AC, this angular spacing can then be less than 45 degrees of angle.

[0069] By grouping the two couplers in the same angular sector of the planet carrier 26, for example with an angular spacing between the first working axis A1 and the second axis of work A2 around the central axis AC which is less than 90 degrees of angle, or even less than 45 degrees of angle, they can be arranged in the same reinforced sector of the planet carrier 26.

[0070] The invention makes it possible to produce a household appliance for food preparation comprising two output couplers, which can in particular have different rotation speeds, by simply changing the planet carrier. 26,without further modifications to an existing device with a single output coupler on its planet carrier. In fact, in both cases, the planet carrier has a single drive gear which meshes directly with the peripheral crown.

Claims

1. Electric household apparatus for food preparation (12) having: - a baseplate (15) having a base (16) having a receiving zone (17) configured to receive a working container (20); - a head (22) connected to the baseplate (15), the head (22) having a planet wheel carrier (26) which is rotated about a central axis (AC) by a motor (30), and which carries: - a first drive planet wheel (28.1), mounted in free rotation on the planet wheel carrier (26) about a first working axis (A1), parallel to the central axis (AC) and off-centre with respect to the central axis (AC), the first drive planet wheel (28.1) having: - a first coupler (30.1) configured to enable a coupling and an uncoupling of a first working tool (14.1) and to ensure the rotation of the first working tool (14.1) about the first working axis (AI) with respect to the planet wheel carrier (26), the first coupler (30.1) being arranged facing the receiving zone (17); - a first toothed drive wheel (32.1) which has for the axis, the first working axis (A1), which rotates integrally with the first drive planet wheel (28.1), and which cooperates with an internal toothing of a peripheral ring (34) having the central axis (AC) as the axis of symmetry to, during a differential rotation of the planet wheel carrier (26) with respect to the peripheral ring (34), cause a rotation of the first drive planet wheel (28.1) on itself about the first working axis (A1); - a second drive planet wheel (28.2), distinct from the first drive planet wheel (28.1) and mounted in free rotation on the planet wheel carrier about a secondworking axis (A2), parallel to the central axis (AC) and off-centre with respect to the central axis (AC) while being distinct from the first working axis (A1), the second drive planet wheel (28.2) having: - a first second (30.2) configured to enable a coupling and an uncoupling of a second working tool (14.2) and to ensure the rotation of the second working tool (14.2) about the second working axis (A2) with respect to the planet wheel carrier (26), the second coupler (30.2) being arranged facing the receiving zone (17) ; - a second toothed drive wheel (32.2) which has for the axis, the second working axis (A2) and which rotates integrally with the second drive planet wheel; the second toothed drive wheel (32.2) cooperating with the first toothed drive wheel (32.1) indirectly, through at least one intermediate transmission wheel (40), mounted free in rotation on the planet wheel carrier (26), such that the first toothed drive wheel (32.1) rotates the second toothed drive wheel (32.2) and the second drive planet wheel (28.2) on themselves about the second working axis (A2), through the at least one intermediate transmission wheel (40); characterised in that the second drive planet wheel (28.2) rotates, about the second working axis (A2), in the same direction of rotation as the direction of rotation of the first drive planet wheel (28.1) about the first working axis (A1).

2. Electric household apparatus for food preparation (12) according to claim 1, characterised in that the second toothed drive wheel (32.2) cooperates with the first toothed drive wheel (32.1) indirectly, through one single intermediate transmission wheel (40), mounted free in rotation on the planet wheel carrier (26), the single intermediate transmission wheel (40) meshing directly with the first toothed drive wheel (32.1) and, simultaneously, meshing directly with the second toothed drive wheel (32.2).

3. Electric household apparatus for food preparation (12) according to claim 1, characterised in that it has several intermediate transmission wheel (40), cascaded between the first toothed drive wheel (32.1) and the second toothed drive wheel (32.2) the intermediate transmission wheels (40) being toothed wheels with external toothing mounted free in rotation on the planet wheel carrier (26).

4. Electric household apparatus for food preparation (12) according to any one of claims 1 to 3, characterised in that the first toothed drive wheel (32.1) and the second toothed drive wheel (32.2) each have a different number of teeth.

5. Electric household apparatus for food preparation (12) according to claim 4, characterised in that the second toothed drive wheel (32.2) has a number of teeth less than that of the first toothed drive wheel (32.1), such that, for a given speed of the planet wheel carrier (26), the second drive planet wheel (28.2) rotates, about the second working axis (A2), at a rotation speed, the absolute value of which is greater than the absolute value of the rotation speed of the first drive planet wheel (28.1) about the first working axis (A1).

6. Electric household apparatus for food preparation (12) according to any one of claims 1 to 5, characterised in that the second drive planet wheel (28.2) rotates, about the second working axis (A2), at a rotation speed of between 1.1 and 2.0 times the rotation speed of the first drive planet wheel (28.1) about the first working axis (A1).

7. Electric household apparatus for food preparation (12) according to any one of claims 1 to 6, characterised in that the peripheral ring (34), the first toothed drive wheel (32.1), the second toothed drive wheel (32.2) and the intermediate transmission wheel (40) are coplanar.

8. Electric household apparatus for food preparation (12) according to any one of claims 1 to 7, taken in combination with claim 2, characterised in that: - the peripheral ring (34) has one single internal toothing, - the first toothed drive wheel (32.1) is a toothed wheel having one single external toothing which meshes directly with the internal toothing of the peripheral ring (34), - the intermediate transmission wheel (40) is a toothed wheel having one single external toothing which meshes directly with the external toothing of the first toothed drive wheel (32.1), and - the second toothed drive wheel (32.2) has an external toothing which meshes directly with the external toothing of the intermediate transmission wheel (40).

9. Electric household apparatus for food preparation (12) according to any one of claims 1 to 8, characterised in that the first working axis (A1) and the second working axis (A2) have the same off-centring with respect to the central axis (AC).

10. Electric household apparatus for food preparation (12) according to any one of claims 1 to 9, characterised in that the first coupler (30.1) and the second coupler (30.2) have respectively a first and a second working tool coupling geometry, which are different from one another.

11. Electric household system for food preparation (10) comprising: - an electric household apparatus for food preparation (12) according to any one of claims 1 to 10; - a first working tool (14.1) configured to enable its coupling on the first coupler (30.1) of the electric household apparatus for food preparation (12), - a second working tool (14.2) configured to enable its coupling on the second coupler (30.2) of the electric household apparatus for food preparation (12).

12. Electric household system for food preparation (10) according to claim 11, characterised in that the first working tool (14.1) is configured to prohibit its coupling on the second coupler (30.2).

13. Electric household system for food preparation (10) according to any one of claims 11 or 12, characterised in that the second working tool (14.2) is configured to prohibit its coupling on the first coupler (30.1).

14. Electric household system for food preparation (10) according to any one of claims 11 to 13, characterised in that the first coupler (30.1) is configured to prohibit its coupling of the second working tool (14.2).

15. Electric household system for food preparation (10) according to any one of claims 11 to 14, characterised in that the second coupler (30.2) is configured to prohibit its coupling of the first working tool (14.1).